Re: [RFC PATCH 01/12] virtio/s390: use vring_create_virtqueue

["Michael S. Tsirkin" <mst@redhat.com>]

On Mon, Apr 08, 2019 at 01:01:28PM +0200, Cornelia Huck wrote:
> On Fri,  5 Apr 2019 01:16:11 +0200
> Halil Pasic <pasic@linux.ibm.com> wrote:
> 
> > The commit 2a2d1382fe9d ("virtio: Add improved queue allocation API")
> > establishes a new way of allocating virtqueues (as a part of the effort
> > that taught DMA to virtio rings).
> > 
> > In the future we will want virtio-ccw to use the DMA API as well.
> > 
> > Let us switch from the legacy method of allocating virtqueues to
> > vring_create_virtqueue() as the first step into that direction.
> > 
> > Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
> > ---
> >  drivers/s390/virtio/virtio_ccw.c | 27 ++++++++-------------------
> >  1 file changed, 8 insertions(+), 19 deletions(-)
> > 
> > diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c
> > index 74c328321889..edf4afe2d688 100644
> > --- a/drivers/s390/virtio/virtio_ccw.c
> > +++ b/drivers/s390/virtio/virtio_ccw.c
> 
> > @@ -516,17 +512,10 @@ static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev,
> >  		err = info->num;
> >  		goto out_err;
> >  	}
> > -	size = PAGE_ALIGN(vring_size(info->num, KVM_VIRTIO_CCW_RING_ALIGN));
> > -	info->queue = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO);
> > -	if (info->queue == NULL) {
> > -		dev_warn(&vcdev->cdev->dev, "no queue\n");
> > -		err = -ENOMEM;
> > -		goto out_err;
> > -	}
> > +	vq = vring_create_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN,
> > +				    vdev, true, true, ctx,
> 
> This second true means 'may_reduce_num'. Looking at the vring code, it
> seems that this parameter is never checked; the code will try to
> allocate a smaller queue if it can't get the requested size in any
> case... this will probably be a problem for legacy virtio-pci, which
> explicitly sets may_reduce_num to false. (I can try to come up with a
> patch to fix that.)

Yes, pls do. Not too late for a bugfix to go into the current linux.

> > +				    virtio_ccw_kvm_notify, callback, name);
> >  
> > -	vq = vring_new_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, vdev,
> > -				 true, ctx, info->queue, virtio_ccw_kvm_notify,
> > -				 callback, name);
> >  	if (!vq) {
> >  		/* For now, we fail if we can't get the requested size. */
> >  		dev_warn(&vcdev->cdev->dev, "no vq\n");
> > @@ -534,15 +523,17 @@ static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev,
> >  		goto out_err;
> >  	}
> >  
> > +
> 
> Extra blank line :)
> 
> >  	/* Register it with the host. */
> > +	queue = virtqueue_get_desc_addr(vq);
> >  	if (vcdev->revision == 0) {
> > -		info->info_block->l.queue = (__u64)info->queue;
> > +		info->info_block->l.queue = queue;
> >  		info->info_block->l.align = KVM_VIRTIO_CCW_RING_ALIGN;
> >  		info->info_block->l.index = i;
> >  		info->info_block->l.num = info->num;
> 
> You always fill in the size requested by the host, but the actual size
> may be smaller (see above). I don't think that is allowed for revision
> 0 (which implies !virtio-1). You probably need to call
> vring_create_virtqueue with may_reduce_num=false for revision 0 (and
> wait for the generic vring code to be fixed...)
> 
> >  		ccw->count = sizeof(info->info_block->l);
> >  	} else {
> > -		info->info_block->s.desc = (__u64)info->queue;
> > +		info->info_block->s.desc = queue;
> >  		info->info_block->s.index = i;
> >  		info->info_block->s.num = info->num;
> 
> Here, you need to obtain the actual number via
> virtqueue_get_vring_size().
> 
> >  		info->info_block->s.avail = (__u64)virtqueue_get_avail(vq);